function pageLoad(x){

    xmlhttp=GetXmlHttpObject();if(xmlhttp==null){alert("Browser is not supported!");return;}
	var url="standard.php?content="+x;
	xmlhttp.onreadystatechange=retrieveContent;
	xmlhttp.open("GET",url,true);
	xmlhttp.send(null);}

function retrieveContent(){
    if(xmlhttp.readyState==4){
    document.getElementById("main").innerHTML=xmlhttp.responseText;}}